I did hear them play more rough lately. They have their own room now though so they're out most of the time and I'm not always close by. Simba has always been more of a biter and I remember he used to be very rough when I first got him and Rambo is definitely submisive!!
Simba has lost a lot of weight last year, but Dr Auger seemed to think it was normal (April 2009). He's now half of Rambo's size (since last summer) but he used to be the fat one (in winter 2008)

Could it be a sign of adrenal disease? There is no hair loss or other signs. He's still an energetic little devil

Also something weird, it seems like Simba cleans Rambo's ears lately. They are always perfectly clean??? It was not the case last year.....
Thank for your advice it's appreciated!